Employee stock ownership plan ESOP compensation income expense.

No definition available.

Name:	mec_EmployeeStockOwnershipPlanESOPCompensationIncomeExpense
Namespace Prefix:	mec_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Age in years to qualify for first tier of diversification percentage in ESOP.

+ References

No definition available.

+ Details

Name:	mec_EmployeeStockOwnershipPlanEsopAgeInYearsForFirstTierDiversificationPercentage
Namespace Prefix:	mec_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Distribution period in an Employee Stock Ownership Plan (ESOP).

+ References

No definition available.

+ Details

Name:	mec_EmployeeStockOwnershipPlanEsopDistributionPeriod
Namespace Prefix:	mec_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The Employee Stock Ownership Plan ESOP first tier diversification percentage

+ References

No definition available.

+ Details

Name:	mec_EmployeeStockOwnershipPlanEsopFirstTierDiversificationPercentage
Namespace Prefix:	mec_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of years of service for participation in the Employee Stock Ownership Plan (ESOP).

+ References

No definition available.

+ Details

Name:	mec_EmployeeStockOwnershipPlanEsopNumberOfYearsOfService
Namespace Prefix:	mec_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The Employee Stock Ownership Plan ESOP second tier diversification percentage

+ References

No definition available.

+ Details

Name:	mec_EmployeeStockOwnershipPlanEsopSecondTierDiversificationPercentage
Namespace Prefix:	mec_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 718
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480489/718-40-50-1

+ Details

Name:	us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 718
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 20
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480459/718-40-55-20

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 718
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480459/718-40-55-9

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 718
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480489/718-40-50-1

+ Details

Name:	us-gaap_EmployeeStockOwnershipPlanESOPSharesInESOP
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Employee stock ownership plan - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 01, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Employee stock ownership plan
Distribution period	3 years
Employee stock ownership plan (ESOP) first tier diversification percentage	50.00%					25.00%
Employee stock ownership plan (ESOP) age in years for first tier diversification percentage	55 years					50 years
Employee stock ownership plan (ESOP0 number of years of service	10 years					10 years
Employee stock ownership plan (ESOP0 second tier diversification percentage	75.00%					50.00%
Shares in ESOP		1,903,861		1,903,861		3,474,467
Employee Stock Option
Employee stock ownership plan
Employee stock ownership plan (ESOP), (income) expense		$ 0	$ 0	$ 0	$ 0